October weather forecast
Surabaya, Indonesia

October in Surabaya introduces a slow yet perceptible transition towards the wet season as rainfall gradually increases on the city's vista. The weather remains on the warmer side, but the rising sea temperatures and cloud cover indicate a change in the season. A notable feature of October's weather is the consistent wind speeds that influence the temperatures subtly. Sunshine hours start to reduce, signaling shorter days. As October progresses, the dawn of the rain season is seen through the increasing number and intensity of rainy days.

Temperature

October is the warmest month, exhibiting average temperatures of 32.9°C at the peak and 26.4°C at the base.

Heat index

The heat index value for October is estimated at a blisteringly hot 40°C. Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely significant for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

With an average relative humidity of 63%, October is the least humid month in Surabaya.

Rainfall

In Surabaya, in October, during 7.6 rainfall days, 14mm of precipitation is typically accumulated. Throughout the year, in Surabaya, there are 187.8 rainfall days, and 839mm of precipitation is accumulated.

Sea temperature

In Surabaya, in October, the average water temperature is 28.9°C.
Note: In water temperatures ranging between 25°C and 29°C, activities such as swimming and diving become highly pleasurable for long durations.

Daylight

The average length of the day in October is 12h and 16min.
On the first day of October, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

Sunshine

August through October, with an average of 9.9h of sunshine, are months with the most sunshine in Surabaya.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In October, the maximum UV index of 7 suggests these recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Warning! The Sun's UV rays intensify with reflections from sand and water.